Roller blind



FIG. 1 is a perspective view, taken from the front and left side, of a roller blind, in accordance with our new design;

FIG. 2 is a front elevation view of the roller blind shown in FIG. 1;

FIG. 3 is a rear elevation view of the roller blind shown in FIG. 1;

FIG. 4 is a side elevation view of the roller blind shown in FIG. 1, taken from the left side of FIG. 1;

FIG. 5 is a side elevation view of the roller blind shown in FIG. 1, taken from the right side of FIG. 1;

FIG. 6 is a top plan view of the roller blind shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the roller blind shown in FIG. 1. 

CLAIM The ornamental design for a roller blind, as shown. 